"I know they are negotiating a transfer and I hope they sort things out as soon as possible so I know what my future will be," Senna told the Villarreal website on Tuesday.

The Brazilian-born 30-year-old was part of the Spain squad in the World Cup finals in Germany, and was a central figure in the Villarreal side that reached the semi-finals of the Champions League last season.

"Villarreal opened their doors for me and I am very happy here," he added.

"The club have signed some good new players and I have always said my ambition is to win a title with this club. This season is a great chance to do that."

Villarreal have brought in midfielders Robert Pires, Cani and Leandro Somoza during the close season, along with Turkish striker Nihat Kahveci.

United have just completed the signing of England midfielder Michael Carrick from Tottenham Hotspur for a fee of up to 18.6 million pounds ($34.6 million).